PERE MARQUETTE TWP. -- Michigan State Police officials and a bomb squad Monday were called in to remove several large explosive devices discovered in the garage of a Ludington-area man.

State Police Sgt. Troy Fellows of the Hart Post said someone who had been inside the man's garage at 5902 West Pleasant Ridge Drive in Pere Marquette Township called to report the explosives to authorities.

Around 4:30 p.m. on Monday, state police and officials from the Bureau of Alcohol, Tobacco, Firearms and Explosives based in Grand Rapids responded to the scene, Fellows said.

Authorities removed about a dozen six-inch homemade explosives that the man made for "personal use," he said.

The devices were manufactured with "hard cardboard" material and packed with "black powder and saw dust," he said. They were apparently intended to be "large firecrackers," Fellows said.

The case is under review by the Mason County Prosecutor's Office because it is illegal to manufacture or sell such explosives in Michigan.

Fellows said the middle-aged man was "very cooperative" when contacted about the devices and it appears he had no intention of selling them.

"He had made these in the past. He hadn't been threatening anyone with them," Fellows said.

The explosives -- equivalent to an M-100 -- had likely been stored in the man's garage for several years before they were discovered, Fellows said. According to information on the ATF Web site, an M-100 when ignited can cause "severe damage to face, arms and body."

The state police obtained a search warrant before entering the man's garage, but a "bomb squad" was needed to remove the devices, Fellows said.

"We don't ever go in on our own to get those things. We have to be super cautious about those kind of things," he said.